digitalmars.D - Re: memory-mapped files

from mac optimizations guidelines:
http://developer.apple.com/documentation/Performance/Conceptual/FileSystem/Articles/FilePerformance.html
#Minimize the number of file operations you perform. For more information, see
“Minimize File System Access.”
#Group several small I/O transfers into one large transfer. A single write of
eight pages is faster than eight separate single-page writes, primarily because
it allows the hard disk to write the data in one pass over the disk surface.
For more information, see “Choosing an Optimal Transfer Buffer Size.”
#Perform sequential reads instead of seeking and reading small blocks of data.
The kernel transparently clusters I/O operations, which makes sequential reads
much faster.